West Sussex · England
Barnham Sand Mastic
We cover Barnham for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Modern sealant on a period surround
- Cement or filler used on old window joints that has cracked
- Cracked mastic round a front door frame
Common problems we fix in Barnham
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out so we make sure the new mastic is the right thickness.
Look out for these signs:
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- Modern sealant on a period surround
Schools such as Barnham Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- How the joint is cleaned and prepared
- Whether VAT is included
- What happens if the job turns out different
- What product goes in the joint
Sand mastic in Barnham, done properly
We work across Barnham renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on tenement windows, period & listed homes and timber door frames, and common reasons people get in touch are cracked mastic round a front door frame and old sand mastic that has cracked, crumbled or fallen out.
Around Barnham, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Each job carries a 12-month guarantee.
- Location
- Barnham (PO22)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
Before booking, it’s worth knowing the limits too:
- Damaged stone surrounds
- Sash cords, weights and draught-proofing of the sashes
- Planning or listed building consent (your local planning authority decides)
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Barnham
- Tenement windows
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
- Stone surrounds
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What sand mastic looks like in Barnham
Barnham is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Barnham station, older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to The Parish Church of St Mary include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Barnham is about 4 miles north-east of Bognor Regis, in West Sussex. From the centre of Barnham to the outskirts, we cover sand mastic for every kind of property. Barnham is one of 371 places in West Sussex we cover. For nearby work, see our Portsmouth page, about 19 miles away.
Every address in PO22 is covered for sand mastic, from the main roads to the quietest streets. Streets in the area include Garden Crescent, Dollery Road and Goodacres, all of which we cover. We also cover West Barnham (1 mile north-west), Walberton (1 mile north-east), Yapton (1 mile south-east), Eastergate (1 mile north-west) and Lidsey (1 mile south-west). We also work in nearby towns such as Worthing (10 miles east), Bognor Regis (4 miles south-west), Chichester (6 miles west), Selsey (9 miles south-west), Littlehampton (5 miles east) and Lancing (14 miles east).
Around Barnham
We work in homes and buildings around The Murrell Arms and St Philip Howard Catholic High School. Barnham has its own railway station: Barnham station. Nearby you will also find Bognor Regis War Memorial Hospital (3.2 miles south-west) and Tote Copse Castle (2.5 miles west). For a walk, there’s WWT Arundel.
Questions from Barnham
I let a flat near Barnham station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Is Barnham within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Where do you work from?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. Timing depends on the weather and the joint.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
Towns and villages near Barnham
Other services in Barnham
Aftercare tips
After the cure time, these simple habits help:
- Clear gutters so water does not pour onto the windows
- Renew mastic before redecorating the windows
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Barnham, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Read more
Different surfaces, different methods
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
What affects the quote in Barnham
There’s no set price list. The quote depends on:
- Any working-time requirements on site
- Whether there’s mould to deal with
- Access and height
- The number of rooms or windows
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and give you a clear price before work begins.
What we need to know
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- Where the property is
- How we’d reach the joints
We don’t publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or drop us an email.